Graphic user interface for a portion of a display screen



FIG. 1 is a front view of a graphic user interface for a portion of a display screen showing our new design; and,

FIG. 2 is a front view of a graphic user interface for a portion of a display screen showing a second embodiment of our new design.

The broken line showing of the portion of a display screen display screen and features in the right corner in FIGS. 1 and 2, and the arrow-shaped regions in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a graphic user interface for a portion of a display screen, as shown and described. 